Click comic to ENLARGE.
The Tokyo Metro has been running a 'manners campaign' for several years, and each month publishes a new poster in stations. Over the months, the campaign has pretty much covered every bit of proscribed activity (don't throw up on your fellow passengers, don't practice your golf swing on the platform with a wet umbrella, etc.) imaginable, and three months ago moved on to behavior that is apparently encouraged.
The above images are 'repurposed' from a campaign poster that urges passengers be considerate of their fellow travelers when they are carrying large pieces of luggage, and the punchline of this particular comic pokes fun at Japanese (and nearly everyone does it) who extravagantly compliment foreigners on their Japanese language speaking ability if they can manage to say as little as "thank you" with a halfway decent accent.
[To see other cartoons and comics in the Tokyo Metro series, click here or on "Tokyo Metro" in the labels below.]